MICROSTRUCTURE AND SUSCEPTIBILITY TO STRESS-CORROSION CRACKING OF AL-ZN-MG WELDMENTS (AA-7017)

被引:12
作者
GARCIACORDOVILLA, C
LOUIS, E
PAMIES, A
CABALLERO, L
ELICES, M
机构
[1] UNIV COMPLUTENSE MADRID,ETS INGN CAMINOS,DEPT CIENCIA MAT,E-28040 MADRID,SPAIN
[2] UNIV ALICANTE,DEPT FIS APLICADA,E-03080 ALICANTE,SPAIN
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1994年 / 174卷 / 02期
关键词
D O I
10.1016/0921-5093(94)91086-3
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Massive samples with a microstructure similar to the so-called white zone (WZ) were produced to investigate the effects of the heat-affected zone on the susceptibility to stress corrosion cracking (SCC) of AA7017 weldments. Both base (B) and WZ materials were subjected to natural aging (NA) and to several artificial agings (AAs) at 150 degrees C. Their microstructures were examined by means of optical and electron microscopies and differential scanning calorimetry, whereas the susceptibility to SCC was evaluated by means of slow strain rate tests and measurements of the crack growth rate in aggressive environments. The results indicate that WZ samples are much more susceptible to SCC than the B material in the T651 temper, B(AA8h). In particular, crack growth rates were found to vary from 2 x 10(-9) ms(-1) to 5 x 10(-6) ms(-1) and to follow the order B(AA8h)< WZ(AA8h)< B(NA)< WZ(NA). Homogenization of the WZ material and recrystallization of the B material decrease their crack growth rates. Attempts are made to correlate these results with the salient features of the microstructure of the different materials. It was shown that the type and the spatial distribution of the particles have a more pronounced effect on the resistance to SCC than do the grain structures.
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页码:173 / 186
页数:14
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